A Boeing-owned 787 taxis past a group of 787's after a demonstration flight meant to be the final certification test for the 787's new battery system at Paine Field in Everett, Wash., Friday, April 5, 2013. Boeing called the flight "the final certification test for the new battery system." The next step will be for the Federal Aviation Administration to decide whether Boeing's battery fix is good enough for airlines to safely fly it again. The test was "to demonstrate that the new system performs as intended during normal and non-normal flight conditions," Boeing spokesman Marc Birtel said. The 787 Dreamliner has been grounded since mid-January because of smoldering batteries, including a fire on the ground in Boston. Boeing has designed what it says is a fix, including more heat insulation and a battery box designed so that any meltdown of the lithium-ion battery will vent the hot gases outside of the plane. (AP Photo /The Herald, Mark Mulligan)

The Wall Street Journal reports that the Federal Aviation Administration is set to approve Boeing's fix for the ion-lithium batteries. The 787 Dreamliner has been grounded since mid-January because of smoldering batteries that in one case caused a serious fire.

The Journal says the FAA is expected to announce Friday that Boeing's redesigned batteries are safe. The fix includes more heat insulation and a battery box designed to vent any hot gases from the batteries outside the planes.

There was no immediate comment from the FAA and a Boeing spokesman declined to comment on the report.

The New York Times, which also reported the development, says the aircraft could be back in service next month.

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